The asymmetric unit of the title complex, [Ni(C6H6N2O)2(H2O)4](C8H5O3)2&#183;2H2O, contains one-half of the complex cation with the NiII atom located on an inversion center, a 4-formylbenzoate (FB) counter-anion and an uncoordinated water molecule. The four O atoms in the equatorial plane around the Ni atom form a slightly distorted square-planar arrangement and the slightly distorted octahedral coordination is completed by the two N atoms of the isonicotinamide (INA) ligands at a sligthly longer distance in the axial positions. The dihedral angle between the carboxylate group and the attached benzene ring is 8.14&#8197;(11)&#176;, while the pyridine and benzene rings are oriented at a dihedral angle of 3.46&#8197;(6)&#176;. In the crystal structure, O&#8212;H...O, N&#8212;H...O and C&#8212;H...O hydrogen bonds link the molecules into a three-dimensional network. &#960;&#8211;&#960; Contacts between the benzene and pyridine rings [centroid&#8211;centroid distance = 3.751&#8197;(1)&#8197;&#197;] may further stabilize the crystal structure
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